JPS587062Y2 - Condensed water separation and discharge device for supercharged engines - Google Patents

Description

[Detailed Description of the Invention] In recent years, as engines have become highly supercharged, the pressure ratio of superchargers has increased, and the need for cooling compressed air by air coolers has tended to increase.

Along with this, the number of water droplets in the cooling air is also increasing, which is having a serious impact on the wear life of the intake valves.

As a countermeasure against this problem, a system in which a water droplet separator 2 is provided on the outlet side of an air cooler 1 as shown in FIG. 1 has been put into practical use.

Exhaust gas discharged from the engine 3 is supplied to the supercharger 5 via the exhaust manifold 4, giving rotational force to the turbine in the supercharger 5, and air pressurized by a blower directly connected to the turbine is discharged. The air enters the air cooler 1 from the outlet 6, and after being cooled, it is supplied to each cylinder head of the engine 3 from the intake manifold 7.

However, if the water droplet separator 2 is installed on the outlet side of the air cooler 1 as shown in the figure, (1) the pressure loss of the supply air becomes extremely large, (2) the structure becomes complicated and the cost becomes high, and (3) the air cooling becomes difficult. Every time the size of the container 1 changes, it is necessary to replace it with a water droplet separator that is compatible with the air cooler. (4) If the air supply manifold is built-in, this type of water droplet separator cannot be used. There are problems such as...

In addition, conventionally, a particularly curved connecting pipe is provided between the outlet of the air cooler and the inlet of the air supply manifold, so that when the cooling air passes through the connecting pipe in a curved manner, condensed water is generated on the inner surface of the connecting pipe. However, in that case, since the flow velocity in the curved pipe section is slow, almost no condensed water can be generated in the curved pipe section, and the cross-sectional area must be reduced to make the flow velocity such that the condensed water adheres to the inner surface of the curved pipe. If it is made too small, the resistance will become too large.

Therefore, it is not currently put into practical use. This invention forms a curved part in the air supply pipe near the cylinder head inlet where the intake air flow rate is relatively increased, thereby increasing the centrifugal force acting on water droplets and making it easier for condensed water to adhere to the inner surface of the air supply pipe. At the same time, it is designed to effectively capture condensed water adhering to the inner surface of the air supply pipe as close as possible to the cylinder head inlet. An example is shown in Fig. 2.

9 in Figure 2 is an air cooler with a built-in intake manifold, the inlet of which is connected to the pressurized air discharge port of the supercharger, and the outlet 10
is connected to the cylinder head 8 of each cylinder via a plurality of intake pipes 11.
is connected to the inlet portion 12 of the inlet via an annular flange 13.

The upper end of the air supply pipe 11 is generally vertical, the lower end is generally horizontal and continues to the air supply passage 14 in the cylinder head, and the portion between them is gently curved.

A thin plate cylindrical portion 15 having a portion of a bench lily (drum shape) extends upstream (to the right in the figure) from the inner circumferential edge of the annular flange 13 (see FIG. 3), and extends between its tip edge 16 and the inner surface 17 of the air supply pipe. An annular gap forms a water droplet inlet 18, and an annular groove 19 with a clear chevron-shaped cross section is provided on the inner surface of the air supply pipe surrounding the cylindrical part 15.
A water droplet space 20 is formed by the cylindrical part 15 and the space 20
The upper end of the drain pipe 22 is connected to a screw hole 21 provided at the lower end, and the lower end of the drain pipe 22 is open to the atmosphere.

The pressurized air, which has been pressurized by the supercharger and whose temperature has increased, is cooled while passing through the air cooler 9, and water droplets are generated inside.

These water droplets flow downward through the outlet 10 together with the cooling air, but since the air supply pipe 11 is curved approximately 900 degrees, the water droplets collide with the inner surface of the air supply pipe 17 as shown by the dashed arrow due to the action of centrifugal force, forming large water droplets. The water drops flow down while growing, accumulate in the space 20 through the water droplet inlet 18, and are quickly discharged from the drain pipe 22.

On the other hand, the cooling air from which water droplets have been removed is drawn into the combustion chamber through the cylindrical portion 15, the air supply passage 14, and the intake valve 23, as shown by the solid arrow.

In the embodiment shown in FIG. 4, an air cooler (not shown) is connected to one end of the air intake manifold 25, and an air intake pipe section 26 extending from the main body of the air intake manifold 25 to each cylinder head 8 is connected to one end of the air intake manifold 25, as shown in FIG. It is curved like the air supply pipe 11 of , and a water droplet extraction device consisting of an annular flange 13 and a cylindrical part 15 is installed between it and the head artificial part 12.

In this case as well, due to the curvature of the air supply pipe section 26, water droplets collide and adhere to the inner surface of the air supply pipe section 26 due to centrifugal force, and are collected at a position as close as possible to the head prosthesis section 12.

As explained above, according to the present invention, the air supply pipe that connects the air intake manifold of a multi-cylinder engine to each head is bent, and air containing water droplets (with a high flow rate) collides with the inner surface of the pipe, thereby separating the water droplets. At the same time, a water droplet extraction device shown in Fig. 3 was installed in each cylinder head port, so (1)
The same device can be used depending on the engine, regardless of the structure of the air supply and exhaust system.

That is, regardless of the shape of the air cooler, if the cylinder head is the same, the same water droplet extraction device can be used, improving mass productivity.

(2) In the case of intercoolers with built-in air supply manifolds, which are often used in small and medium-sized engines, it was impossible to collect water droplets using conventional methods, but this is now possible with the present invention.

(3) Even in the case of a large-sized independent air cooler, it can be installed in the head section of the air supply manifold in the same way (Fig. 4).

(4) In the present invention, the air supply pipes 1 for each cylinder extend downward from multiple locations on the substantially horizontal main body of the air intake manifold.
1 is sharply curved at approximately right angles and its tip is connected approximately horizontally to the cylinder head inlet portion 12, so that the compression from the outlet 10 of the air cooler or the air cooler 9 with built-in intake manifold is reduced. The flow rate of the air becomes faster and the compressed air flows out from the outlet 10 substantially downward, so that the water droplets contained therein are affected by the action of gravity and are pushed to the bottom of the air supply pipe 11 as shown by the dashed arrow in FIG. The inner surface 17 of the soil effectively collides with the soil and is separated from the air.

That is, the flow velocity in the air supply pipe 11 branched from the manifold is generally higher than that in the manifold, and the air supply pipe 11 extends downward from the manifold outlet 10 and then sharply curves at a substantially right angle, so that the flow rate of water droplets is reduced. Water droplets can be captured on the inner surface 17 of the air supply pipe by using the inertial force as a limit.

(5) Water droplet extraction device A (Fig. 3) is cylinder head 8.
Since it is located close to the inlet 12 of the air supply passage 14 of The air is immediately supplied to the engine via the short air supply passage 14.

That is, there is an advantage in that it is possible to provide as long a section as possible for steam and water separation, thereby reducing the amount of water droplets sucked into the engine.

(6) Furthermore, in the present invention, since the cylindrical portion 15 for forming the water storage space 20 is hourglass-shaped, the inner surface of the air supply pipe
The water droplets that have migrated from the upper half of 7 to the upper surface of the cylindrical part 15 flow downward in the annular groove formed on the outer periphery of the cylindrical part 15, and once the water droplets are captured, they reach the entrance of the air supply passage. 1
There is an advantage in that it can reliably prevent reaching 2.

[Brief explanation of drawings]

Fig. 1 is a partial plan view showing a conventional layout, Fig. 2 is a partial vertical sectional view showing an embodiment of the present invention, Fig. 3 is a perspective view of the water droplet extraction device in Fig. 2, and Fig. 4 is a partial plan view showing a conventional layout. FIG. 7 is a partially cross-sectional plan view showing another embodiment. 8... Cylinder head, 9... Air cooler with built-in air supply manifold, 11... Curved air supply pipe, 12
...Curved head inlet, 13.Curved annular flange, 15.
- Curved portion, 18... Curved water droplet inlet, 2o... Curved water storage space, 22... Drain pipe, 25... Curved air supply manifold.

Claims (1)

[Scope of utility model registration request] Connect the intake manifold to the pressurized air discharge port of the turbocharger via an air cooler, or connect an air cooler with a built-in intake manifold, and connect the intake manifold downward from multiple points on the nearly horizontal body of the intake manifold. An air supply pipe for each cylinder extending from the air supply pipe is curved at a substantially right angle and its tip is connected approximately horizontally to the cylinder head inlet, an annular flange is sandwiched between the cylinder head inlet and the air supply pipe, and the inside of the flange A short, drum-shaped cylindrical part protrudes upstream from the periphery, and an annular water droplet inlet is provided between the tip edge of the cylindrical part and the inner surface of the air supply pipe, and is formed around the cylindrical part in continuation with the water droplet inlet. A condensed water separation and discharge device for a supercharged engine, characterized in that a drain pipe is connected to the lower end of an annular water storage space.